[Radek]

I've never killed Harepsia. I have heard that she drops the orb when you kill her. If so then keep the orb for later use. More about the orb in the unpatched game:
1. You do not need the quest. You can exchange the orb for the staff even without the quest. Therefore, she should have dropped the orb when you kill her.
2. The orb survives Reset Adventures (!)
3. The orb looks like Amulet of Life. Rose gem on a thin chain.
4. You cannot use the orb anyhow even if a mage or a warlock can equip it.
5. Killing Harepsia = losing an ankh in the chest under the house. Except the ankh, the chest does not contain anything too interesting.
6. Telling the fortune: she wants 300 gold but she takes nothing. You can come to her even without gold at all.
7. You must type in "Orb of Clarity" when you ask about the orb. You do not need to have your fortune told before asking about the orb. Decline her offer saying "no" and then ask about the orb. This saves your time and nerves.